41+ Block Diagram Arduino Uno Pin Schematic Pics. I redistributed the original arduino uno schematic to be more readable below. Ground pins are often represented by gnd on schematics.

4 Arduino Technical Details Arduino A Technical Reference Book from www.oreilly.com

Here the arduino uno schematic diagram (click to enlarge): The arduino uno is the most popular one among other arduino development boards. Arduino nano has similar functionalities as arduino duemilanove but with a different package.

Each of the 14 digital pins on the arduino uno can be used as an input or output, using pinmode(), digitalwrite(), and digitalread() functions.

All the 14 digital pins of arduino can be used as input as well as output. This reference design are provided as is & with all faults. Ground pins are often represented by gnd on schematics. It has 14 digital input/output pins (of which 6 may be employed as pwm outputs), 6 analog inputs, a 16 mhz crystal oscillator, a usb connection.